/Engine/Source/Runtime/InteractiveToolsFramework/Public/BaseGizmos/IntervalGizmo.h
BydefaultCreateNewGizmoActor()returns a default Gizmo Actor suitable for a three-axis Interval Gizmo, override this function to customize the Actor sub-elements.
class FIntervalGizmoActorFactory
UGizmoViewConte...
GizmoViewContext
Needs to be set (and kept alive elsewhere) so that created handle gizmos can adjust their length according to view (when not using world-scaling).